Use the two methods together without adding a lifecycle

HCD.18 supplies a specification when one is needed. Its complete result includes fit, task denominator, selected properties and scale meanings, evidence and missingness, result interpretation, contrasts, protected trade-offs, and stops or reopens. It inherits general specification construction from A.19.ECS and supplies the instructional domain choices.

HCD.19 uses that specification to connect the exact material, subject criterion, available reader responses, actual assistance and repair. Compatible observations and qualified source inspection can finish a bounded diagnosis; missing evidence still withholds its dependent claim. Select further reader work only when its obtainable contribution warrants the full burden under the actual access, participation and protection conditions. Its result feeds E.23 improvement. If selecting among alternatives is live, E.22 supplies comparison under a common qualified basis. A new book format or a different teacher arrangement may change that basis; preserve earlier results instead of quietly relabelling them.

For long material, a whole-route conclusion needs connected inspection of the complete declared route and its cross-part dependencies. For a local defect, inspect the smallest complete semantic reach and reuse unaffected evidence. A moved explanation can change the next-use prefix even if its words are unchanged.

NSTD contributes only when the narrative question is live. NSTD.6 distinguishes the current product, promised source-to-result fidelity, and actual construction history. NSTD.8 supplies the attachment and available-prefix method. NarrativeRenderingEpiplexity is NSTD.6’s narrative specialization of C.2.8 over the expressed episteme, expression and observer, qualified by the selected structure and reading conditions. Reuse a structural result only when those values match. It is not observed cognitive load or learning effectiveness, and non-narrative material can use C.2.8 directly through HCD.18/.19. Retain a human report of difficulty and narrow any untested audience or experienced-burden claim now; the supported material diagnosis can finish with that human question unresolved. Select an appropriately timed observation of the actual reader only when its obtainable contribution can change the receiving decision enough to warrant the full design, preparation, reader, provider, interpretation, delay and displaced-work burden, with the needed access, participation and protection. Selecting the observation does not establish its result.

The time-accounting case makes the joint result concrete. M0’s uninterrupted example fits both active effort and elapsed turnaround. A prepared reader correctly separates them anyway and identifies its prior-knowledge contribution. M1 repairs the definitions, columns, interruption example, and population denominator. The same reader then correctly compares three consumed person-hours with four available person-hours in a changed two-person case. The material repair and bounded changed-condition use are supported; novice learning is not observed.

HCD.18’s full Time-use S1 specification also requires a concurrent-person example, an inspected task-and-key arrangement, and audience-compatible explanatory and feedback evidence. HCD.19’s complete replay returns those residual repairs or gaps instead of treating the successful agent answers as a complete positive evaluation. The practitioner can now decide exactly what to add and what to observe next.